Figure 3The IP pixel pattern along the Debye-Scherrer (DS) rings appearing as almost straight lines in the left-hand panel, with logarithmic intensity colour scale. In the upper right-hand panel the innermost DS ring is shown on an expanded pixel scale, and with logarithmic intensity colour scale. The calculated DS footprint (blue line) is explained in further detail in §3.3 and in Appendix A. The lower right-hand panel shows the attenuated direct beam spot on an expanded pixel scale with linear colour scale.